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Added MQTT library
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Mark Qvist
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223
sbapp/mqtt/reasoncodes.py
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223
sbapp/mqtt/reasoncodes.py
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# *******************************************************************
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# Copyright (c) 2017, 2019 IBM Corp.
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#
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# All rights reserved. This program and the accompanying materials
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# are made available under the terms of the Eclipse Public License v2.0
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# and Eclipse Distribution License v1.0 which accompany this distribution.
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#
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# The Eclipse Public License is available at
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# http://www.eclipse.org/legal/epl-v20.html
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# and the Eclipse Distribution License is available at
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# http://www.eclipse.org/org/documents/edl-v10.php.
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#
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# Contributors:
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# Ian Craggs - initial implementation and/or documentation
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# *******************************************************************
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import functools
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import warnings
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from typing import Any
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from .packettypes import PacketTypes
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@functools.total_ordering
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class ReasonCode:
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"""MQTT version 5.0 reason codes class.
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See ReasonCode.names for a list of possible numeric values along with their
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names and the packets to which they apply.
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"""
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def __init__(self, packetType: int, aName: str ="Success", identifier: int =-1):
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"""
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packetType: the type of the packet, such as PacketTypes.CONNECT that
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this reason code will be used with. Some reason codes have different
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names for the same identifier when used a different packet type.
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aName: the String name of the reason code to be created. Ignored
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if the identifier is set.
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identifier: an integer value of the reason code to be created.
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"""
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self.packetType = packetType
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self.names = {
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0: {"Success": [PacketTypes.CONNACK, PacketTypes.PUBACK,
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PacketTypes.PUBREC, PacketTypes.PUBREL, PacketTypes.PUBCOMP,
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PacketTypes.UNSUBACK, PacketTypes.AUTH],
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"Normal disconnection": [PacketTypes.DISCONNECT],
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"Granted QoS 0": [PacketTypes.SUBACK]},
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1: {"Granted QoS 1": [PacketTypes.SUBACK]},
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2: {"Granted QoS 2": [PacketTypes.SUBACK]},
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4: {"Disconnect with will message": [PacketTypes.DISCONNECT]},
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16: {"No matching subscribers":
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[PacketTypes.PUBACK, PacketTypes.PUBREC]},
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17: {"No subscription found": [PacketTypes.UNSUBACK]},
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24: {"Continue authentication": [PacketTypes.AUTH]},
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25: {"Re-authenticate": [PacketTypes.AUTH]},
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128: {"Unspecified error": [PacketTypes.CONNACK, PacketTypes.PUBACK,
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PacketTypes.PUBREC, PacketTypes.SUBACK, PacketTypes.UNSUBACK,
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PacketTypes.DISCONNECT], },
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129: {"Malformed packet":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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130: {"Protocol error":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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131: {"Implementation specific error": [PacketTypes.CONNACK,
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PacketTypes.PUBACK, PacketTypes.PUBREC, PacketTypes.SUBACK,
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PacketTypes.UNSUBACK, PacketTypes.DISCONNECT], },
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132: {"Unsupported protocol version": [PacketTypes.CONNACK]},
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133: {"Client identifier not valid": [PacketTypes.CONNACK]},
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134: {"Bad user name or password": [PacketTypes.CONNACK]},
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135: {"Not authorized": [PacketTypes.CONNACK, PacketTypes.PUBACK,
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PacketTypes.PUBREC, PacketTypes.SUBACK, PacketTypes.UNSUBACK,
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PacketTypes.DISCONNECT], },
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136: {"Server unavailable": [PacketTypes.CONNACK]},
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137: {"Server busy": [PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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138: {"Banned": [PacketTypes.CONNACK]},
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139: {"Server shutting down": [PacketTypes.DISCONNECT]},
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140: {"Bad authentication method":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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141: {"Keep alive timeout": [PacketTypes.DISCONNECT]},
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142: {"Session taken over": [PacketTypes.DISCONNECT]},
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143: {"Topic filter invalid":
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[PacketTypes.SUBACK, PacketTypes.UNSUBACK, PacketTypes.DISCONNECT]},
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144: {"Topic name invalid":
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[PacketTypes.CONNACK, PacketTypes.PUBACK,
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PacketTypes.PUBREC, PacketTypes.DISCONNECT]},
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145: {"Packet identifier in use":
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[PacketTypes.PUBACK, PacketTypes.PUBREC,
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PacketTypes.SUBACK, PacketTypes.UNSUBACK]},
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146: {"Packet identifier not found":
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[PacketTypes.PUBREL, PacketTypes.PUBCOMP]},
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147: {"Receive maximum exceeded": [PacketTypes.DISCONNECT]},
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148: {"Topic alias invalid": [PacketTypes.DISCONNECT]},
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149: {"Packet too large": [PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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150: {"Message rate too high": [PacketTypes.DISCONNECT]},
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151: {"Quota exceeded": [PacketTypes.CONNACK, PacketTypes.PUBACK,
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PacketTypes.PUBREC, PacketTypes.SUBACK, PacketTypes.DISCONNECT], },
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152: {"Administrative action": [PacketTypes.DISCONNECT]},
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153: {"Payload format invalid":
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[PacketTypes.PUBACK, PacketTypes.PUBREC, PacketTypes.DISCONNECT]},
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154: {"Retain not supported":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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155: {"QoS not supported":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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156: {"Use another server":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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157: {"Server moved":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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158: {"Shared subscription not supported":
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[PacketTypes.SUBACK, PacketTypes.DISCONNECT]},
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159: {"Connection rate exceeded":
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[PacketTypes.CONNACK, PacketTypes.DISCONNECT]},
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160: {"Maximum connect time":
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[PacketTypes.DISCONNECT]},
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161: {"Subscription identifiers not supported":
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[PacketTypes.SUBACK, PacketTypes.DISCONNECT]},
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162: {"Wildcard subscription not supported":
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[PacketTypes.SUBACK, PacketTypes.DISCONNECT]},
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}
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if identifier == -1:
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if packetType == PacketTypes.DISCONNECT and aName == "Success":
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aName = "Normal disconnection"
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self.set(aName)
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else:
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self.value = identifier
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self.getName() # check it's good
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def __getName__(self, packetType, identifier):
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"""
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Get the reason code string name for a specific identifier.
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The name can vary by packet type for the same identifier, which
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is why the packet type is also required.
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Used when displaying the reason code.
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"""
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if identifier not in self.names:
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raise KeyError(identifier)
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names = self.names[identifier]
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namelist = [name for name in names.keys() if packetType in names[name]]
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if len(namelist) != 1:
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raise ValueError(f"Expected exactly one name, found {namelist!r}")
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return namelist[0]
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def getId(self, name):
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"""
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Get the numeric id corresponding to a reason code name.
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Used when setting the reason code for a packetType
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check that only valid codes for the packet are set.
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"""
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for code in self.names.keys():
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if name in self.names[code].keys():
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if self.packetType in self.names[code][name]:
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return code
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raise KeyError(f"Reason code name not found: {name}")
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def set(self, name):
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self.value = self.getId(name)
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def unpack(self, buffer):
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c = buffer[0]
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name = self.__getName__(self.packetType, c)
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self.value = self.getId(name)
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return 1
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def getName(self):
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"""Returns the reason code name corresponding to the numeric value which is set.
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"""
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return self.__getName__(self.packetType, self.value)
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def __eq__(self, other):
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if isinstance(other, int):
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return self.value == other
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if isinstance(other, str):
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return other == str(self)
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if isinstance(other, ReasonCode):
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return self.value == other.value
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return False
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def __lt__(self, other):
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if isinstance(other, int):
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return self.value < other
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if isinstance(other, ReasonCode):
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return self.value < other.value
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return NotImplemented
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def __repr__(self):
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try:
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packet_name = PacketTypes.Names[self.packetType]
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except IndexError:
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packet_name = "Unknown"
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return f"ReasonCode({packet_name}, {self.getName()!r})"
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def __str__(self):
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return self.getName()
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def json(self):
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return self.getName()
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def pack(self):
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return bytearray([self.value])
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@property
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def is_failure(self) -> bool:
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return self.value >= 0x80
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class _CompatibilityIsInstance(type):
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def __instancecheck__(self, other: Any) -> bool:
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return isinstance(other, ReasonCode)
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class ReasonCodes(ReasonCode, metaclass=_CompatibilityIsInstance):
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def __init__(self, *args, **kwargs):
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warnings.warn("ReasonCodes is deprecated, use ReasonCode (singular) instead",
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category=DeprecationWarning,
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stacklevel=2,
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)
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super().__init__(*args, **kwargs)
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